st: re: Frontier ' predict efficiency'

Hii everyone,
I am estimating a frontier half-normal production function, with inclusion of covariates for inefficiency. I tried to do post estimation for % efficiency through predict te, te in stata and generated efficiency estimates. But two issues arise, te generated with inclusion of covariates for inefficiency differ from that generated when i do not include inefficiencey covariates in the model. I am not sure which te I should us, the one after estimation with covariates of inefficiency or the one generated without inefficiency covariates. Can anyone advice.
George
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